587  
FNCA52 TJSJ 090859  
FWFSJU  
 
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO  
NATIONAL WEATHER SERVICE SAN JUAN PR  
459 AM AST THU OCT 9 2025  
   
DISCUSSION  
 
LINGERING MOISTURE CONTINUE TO MOVE OVER THE REGION TODAY,  
PROMOTING ANOTHER ROUND OF HEAVY SHOWERS AND THUNDERSTORM  
ACTIVITY, PARTICULARLY OVER THE CENTRAL MOUNTAIN RANGE; AND  
PORTIONS OF WESTERN AND SOUTHERN PUERTO RICO. WINDS WILL PREVAIL  
FROM THE SOUTHEAST AT AROUND 10 MPH ACROSS THE AREA. RELATIVE  
HUMIDITY VALUES WILL REMAIN AT TO ABOVE THRESHOLDS OVER THE  
SOUTHERN COASTAL PLAINS OF PUERTO RICO (50-60%) DUE TO ABUNDANT  
MOISTURE ACROSS THE AREA. AT THIS TIME, THE FIRE DANGER THREAT  
WILL REMAIN LOW TODAY.  
 
PRZ014-100900-  
SOUTHEAST COASTAL PLAINS-  
459 AM AST THU OCT 9 2025  
 
TODAY TONIGHT FRI  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 30 20 40  
TEMP (24H TREND) 91 (+2) 74 (-2) 90  
RH % (24H TREND) 53 (-15) 90 (-2) 53  
WIND 20FT/EARLY(MPH) SE 8 LGT/VAR S 11  
WIND 20FT/LATE(MPH) SE 8 LGT/VAR S 11  
MIXING HGT(FT-AGL/MSL)4350 3970  
TRANSPORT WND (MPH) SE 7 W 2  
VENT RATE (KT-FT) 26100 7940  
DISPERSION 5 4  
DSI 5 1 5  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 
 
 
PRZ015-100900-  
SOUTHERN HILLS-  
459 AM AST THU OCT 9 2025  
 
TODAY TONIGHT FRI  
 
CLOUD COVER PCLDY MCLEAR PCLDY  
PRECIP TYPE TSTMS SHOWERS TSTMS  
CHANCE PRECIP (%) 50 10 40  
TEMP (24H TREND) 88 (+3) 70 (-3) 88  
RH % (24H TREND) 61 (-10) 98 (+5) 63  
WIND 20FT/EARLY(MPH) SE 5 N 5 S 9  
WIND 20FT/LATE(MPH) SE 5 N 5 S 9  
MIXING HGT(FT-AGL/MSL)4920 4620  
TRANSPORT WND (MPH) SE 6 W 2  
VENT RATE (KT-FT) 24600 9240  
DISPERSION 5 4  
DSI 5 1 4  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 
 
 
PRZ016-100900-  
NORTH COASTAL PLAINS-  
459 AM AST THU OCT 9 2025  
 
TODAY TONIGHT FRI  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE TSTMS SHOWERS TSTMS  
CHANCE PRECIP (%) 60 20 70  
TEMP (24H TREND) 91 (+1) 74 (-2) 91  
RH % (24H TREND) 65 (-2) 98 (+4) 63  
WIND 20FT/EARLY(MPH) E 8 LGT/VAR NW 8  
WIND 20FT/LATE(MPH) E 8 LGT/VAR NW 8  
MIXING HGT(FT-AGL/MSL)4310 3910  
TRANSPORT WND (MPH) SE 5 N 3  
VENT RATE (KT-FT) 17240 11730  
DISPERSION 5 5  
DSI 5 1 5  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 
 
 
PRZ017-100900-  
NORTHERN HILLS-  
459 AM AST THU OCT 9 2025  
 
TODAY TONIGHT FRI  
 
CLOUD COVER PCLDY MCLEAR PCLDY  
PRECIP TYPE TSTMS SHOWERS TSTMS  
CHANCE PRECIP (%) 70 10 60  
TEMP (24H TREND) 89 (0) 72 (-1) 89  
RH % (24H TREND) 66 (-2) 99 (+3) 66  
WIND 20FT/EARLY(MPH) E 6 LGT/VAR W 8  
WIND 20FT/LATE(MPH) E 6 LGT/VAR W 8  
MIXING HGT(FT-AGL/MSL)4940 4640  
TRANSPORT WND (MPH) S 3 NE 1  
VENT RATE (KT-FT) 14820 4640  
DISPERSION 5 4  
DSI 5 1 4  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 
 
 
PRZ018-100900-  
WEST COAST-  
459 AM AST THU OCT 9 2025  
 
TODAY TONIGHT FRI  
 
CLOUD COVER PCLDY MCLEAR PCLDY  
PRECIP TYPE TSTMS NONE SHOWERS  
CHANCE PRECIP (%) 50 0 40  
TEMP (24H TREND) 91 (+1) 73 (-2) 91  
RH % (24H TREND) 62 (-6) 98 (+3) 64  
WIND 20FT/EARLY(MPH) E 6 NE 5 SW 9  
WIND 20FT/LATE(MPH) E 6 NE 5 SW 9  
MIXING HGT(FT-AGL/MSL)4360 4120  
TRANSPORT WND (MPH) S 3 SE 2  
VENT RATE (KT-FT) 13080 8240  
DISPERSION 5 4  
DSI 5 2 5  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 
 
 
PRZ019-100900-  
EASTERN INTERIOR-  
459 AM AST THU OCT 9 2025  
 
TODAY TONIGHT FRI  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE TSTMS SHOWERS TSTMS  
CHANCE PRECIP (%) 70 50 70  
TEMP (24H TREND) 89 (+2) 71 (-3) 90  
RH % (24H TREND) 64 (-5) 99 (+3) 63  
WIND 20FT/EARLY(MPH) SE 8 NW 5 SW 8  
WIND 20FT/LATE(MPH) SE 8 NW 5 SW 8  
MIXING HGT(FT-AGL/MSL)5000 4680  
TRANSPORT WND (MPH) SE 7 NW 3  
VENT RATE (KT-FT) 30000 14040  
DISPERSION 5 5  
DSI 5 1 5  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 
 
 
PRZ022-100900-  
LUQUILLO MOUNTAIN RANGE-  
459 AM AST THU OCT 9 2025  
 
TODAY TONIGHT FRI  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE TSTMS SHOWERS TSTMS  
CHANCE PRECIP (%) 60 50 70  
TEMP (24H TREND) 86 (+4) 69 (-4) 86  
RH % (24H TREND) 68 (-8) 100 (+1) 67  
WIND 20FT/EARLY(MPH) SE 6 LGT/VAR LGT/VAR  
WIND 20FT/LATE(MPH) SE 6 LGT/VAR LGT/VAR  
MIXING HGT(FT-AGL/MSL)4210 4120  
TRANSPORT WND (MPH) SE 7 NW 3  
VENT RATE (KT-FT) 25260 12360  
DISPERSION 5 4  
DSI 6 1 5  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 
 
 
PRZ023-100900-  
CENTRAL MOUNTAIN RANGE-  
459 AM AST THU OCT 9 2025  
 
TODAY TONIGHT FRI  
 
CLOUD COVER PCLDY MCLEAR PCLDY  
PRECIP TYPE TSTMS SHOWERS TSTMS  
CHANCE PRECIP (%) 70 10 60  
TEMP (24H TREND) 87 (+4) 69 (-3) 87  
RH % (24H TREND) 65 (-8) 98 (+3) 66  
WIND 20FT/EARLY(MPH) SE 5 LGT/VAR SW 6  
WIND 20FT/LATE(MPH) SE 5 LGT/VAR SW 6  
MIXING HGT(FT-AGL/MSL)5590 5110  
TRANSPORT WND (MPH) S 3 E 1  
VENT RATE (KT-FT) 16770 5110  
DISPERSION 5 4  
DSI 5 1 4  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 
 
 
PRZ024-100900-  
CAYEY MOUNTAIN RANGE-  
459 AM AST THU OCT 9 2025  
 
TODAY TONIGHT FRI  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE TSTMS SHOWERS TSTMS  
CHANCE PRECIP (%) 40 50 40  
TEMP (24H TREND) 85 (+2) 69 (-3) 85  
RH % (24H TREND) 69 (-4) 100 (+1) 67  
WIND 20FT/EARLY(MPH) SE 5 LGT/VAR S 6  
WIND 20FT/LATE(MPH) SE 5 LGT/VAR S 6  
MIXING HGT(FT-AGL/MSL)4560 4480  
TRANSPORT WND (MPH) SE 6 NW 3  
VENT RATE (KT-FT) 22800 13440  
DISPERSION 5 4  
DSI 5 1 5  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 
 
 
PRZ025-100900-  
VIEQUES-  
459 AM AST THU OCT 9 2025  
 
TODAY TONIGHT FRI  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS TSTMS  
CHANCE PRECIP (%) 50 50 50  
TEMP (24H TREND) 90 (+1) 75 (-2) 90  
RH % (24H TREND) 60 (-5) 97 (+3) 60  
WIND 20FT/EARLY(MPH) E 6 NE 8 S 10  
WIND 20FT/LATE(MPH) E 6 NE 8 S 10  
MIXING HGT(FT-AGL/MSL)3390 3090  
TRANSPORT WND (MPH) E 14 N 9  
VENT RATE (KT-FT) 40680 24720  
DISPERSION 5 5  
DSI 6 5 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 
 
 
PRZ026-100900-  
CULEBRA-  
459 AM AST THU OCT 9 2025  
 
TODAY TONIGHT FRI  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 50 50 40  
TEMP (24H TREND) 92 (+2) 75 (-4) 92  
RH % (24H TREND) 58 (-8) 96 (0) 59  
WIND 20FT/EARLY(MPH) E 6 NE 9 S 9  
WIND 20FT/LATE(MPH) E 6 NE 9 S 9  
MIXING HGT(FT-AGL/MSL)3370 3170  
TRANSPORT WND (MPH) E 14 NW 10  
VENT RATE (KT-FT) 40440 28530  
DISPERSION 5 5  
DSI 6 5 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 
 
 
PRZ027-100900-  
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-  
459 AM AST THU OCT 9 2025  
 
TODAY TONIGHT FRI  
 
CLOUD COVER MCLEAR MCLEAR PCLDY  
PRECIP TYPE TSTMS SHOWERS SHOWERS  
CHANCE PRECIP (%) 40 10 30  
TEMP (24H TREND) 91 (+1) 74 (-3) 92  
RH % (24H TREND) 52 (-13) 91 (+2) 53  
WIND 20FT/EARLY(MPH) SE 9 NE 6 S 11  
WIND 20FT/LATE(MPH) SE 9 NE 6 S 11  
MIXING HGT(FT-AGL/MSL)4640 4190  
TRANSPORT WND (MPH) SE 7 S 5  
VENT RATE (KT-FT) 27840 16760  
DISPERSION 5 5  
DSI 5 1 5  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 
 
 
VIZ001-100900-  
SAINT THOMAS AND SAINT JOHN-  
459 AM AST THU OCT 9 2025  
 
TODAY TONIGHT FRI  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE TSTMS SHOWERS TSTMS  
CHANCE PRECIP (%) 50 50 50  
TEMP (24H TREND) 88 (+2) 73 (-5) 88  
RH % (24H TREND) 65 (-6) 100 (+5) 66  
WIND 20FT/EARLY(MPH) E 8 NE 9 S 12  
WIND 20FT/LATE(MPH) E 8 NE 9 S 12  
MIXING HGT(FT-AGL/MSL)2930 3250  
TRANSPORT WND (MPH) E 16 W 13  
VENT RATE (KT-FT) 41020 35750  
DISPERSION 5 5  
DSI 6 5 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 
 
 
VIZ002-100900-  
ST CROIX-  
459 AM AST THU OCT 9 2025  
 
TODAY TONIGHT FRI  
 
CLOUD COVER PCLDY PCLDY MCLDY  
PRECIP TYPE TSTMS SHOWERS TSTMS  
CHANCE PRECIP (%) 50 50 50  
TEMP (24H TREND) 90 (+2) 76 (-3) 90  
RH % (24H TREND) 63 (-7) 97 (+3) 65  
WIND 20FT/EARLY(MPH) E 6 N 9 S 9  
WIND 20FT/LATE(MPH) E 6 N 9 S 9  
MIXING HGT(FT-AGL/MSL)3600 4260  
TRANSPORT WND (MPH) E 10 W 9  
VENT RATE (KT-FT) 32400 34080  
DISPERSION 5 5  
DSI 6 5 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 
 
 
 
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